单词：high-rate trickling filter
单词：high-rate trickling filter 相关文章
But the HEPA filter for Olivers Vibe got dirty very quickly. And, it was not cleanableit was simply replaceable. When it turned filthy brown, Oliver went back to Target to buy a new filter. Oddly, Target sold the F15 belt for the Vibe, but not the fi
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From VOA Learning English, this is the Health Lifestyle report. In parts of India, it is not uncommon to see people wearing a mask over their nose and mouth. The capital, New Delhi, has some of the world's dirtiest air. The pollution was a call for a
2018年VOA慢速英语(一)月
Good morning. From the CNN center here in Atlanta. I am Melissa Long. It's Thursday, June. Excuse me, July 2nd, July 2nd. Here is a look at some of the stories happening NOW IN THE NEWS. North Korea has reportedly test-fired 4 short-range missiles o
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By Cathy Majtenyi Nairobi 19 May 2008 Fuel efficient stoves and ceramic water purifiers are two examples of low-tech innovations that can help people in poor countries improve their quality of life. Because what is known as appropriate technology usu
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1. A Pakistani-born Virginia man arrested on terrorism charges says he cannot afford an attorney. Farooque Ahmed did not enter a plea and has been ordered held without bond. The FBI says Ahmed cased Washington DC area subway stations in what he thoug
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By Tabinda Naeem Washington, D.C. 21 May 2007 Two years ago, the National Academy of Engineering established the Grainger Challenge Prize for Sustainability. This $1 million award was designed to challenge the world's scientists to develop a practica
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